net/bnxt: simplify representor Rx ring creation

net/bnxt: simplify representor Rx ring creation

rx_queue_setup_op for representor was using a common function to
initialize the software data structures for the Rx ring. But that
routine has code to init other rings not needed for representors like
cp/agg ring etc.
Define and invoke a new function to setup structures just for the
representor Rx ring

Fixes: 6dc83230b43b ("net/bnxt: support port representor data path")
Cc: stable@dpdk.org
Signed-off-by: Somnath Kotur <somnath.kotur@broadcom.com>
Reviewed-by: Venkat Duvvuru <venkatkumar.duvvuru@broadcom.com>
Reviewed-by: Ajit Khaparde <ajit.khaparde@broadcom.com>